[devtools] Support different encodings for Page.CaptureScreenshot.

ui/snapshot/snapshot.h

Index: ui/snapshot/snapshot.h
diff --git a/ui/snapshot/snapshot.h b/ui/snapshot/snapshot.h
index 4b2733c1536b846fa85d51cd25dc3a6b2ce703a7..90b88b258b9725d48ab850b6eedd0a8dea0fdbc3 100644
--- a/ui/snapshot/snapshot.h
+++ b/ui/snapshot/snapshot.h
@@ -5,6 +5,7 @@
 #ifndef UI_SNAPSHOT_SNAPSHOT_H_
 #define UI_SNAPSHOT_SNAPSHOT_H_
 
+#include <stdint.h>
 #include <vector>
 
 #include "base/callback_forward.h"
@@ -25,6 +26,14 @@ class Size;
 
 namespace ui {
 
+enum class SnapshotEncoding { PNG, JPEG };
+constexpr SnapshotEncoding kSnapshotEncodingDefault = SnapshotEncoding::PNG;
+
+using SnapshotQuality = uint8_t;
+constexpr SnapshotQuality kSnapshotQualityMin = 0;
+constexpr SnapshotQuality kSnapshotQualityDefault = 80;
+constexpr SnapshotQuality kSnapshotQualityMax = 100;
+
 // Grabs a snapshot of the window/view. No security checks are done. This is
 // intended to be used for debugging purposes where no BrowserProcess instance
 // is available (ie. tests). This function is synchronous, so it should NOT be
@@ -33,14 +42,17 @@ namespace ui {
 // synchronous function first and if it returns false call the async one.
 SNAPSHOT_EXPORT bool GrabWindowSnapshot(
     gfx::NativeWindow window,
-    std::vector<unsigned char>* png_representation,
-    const gfx::Rect& snapshot_bounds);
+    std::vector<unsigned char>* encoded_data,
+    const gfx::Rect& snapshot_bounds,
+    SnapshotEncoding encoding = kSnapshotEncodingDefault,
+    SnapshotQuality quality = kSnapshotQualityDefault);
 
 SNAPSHOT_EXPORT bool GrabViewSnapshot(
     gfx::NativeView view,
-    std::vector<unsigned char>* png_representation,
-    const gfx::Rect& snapshot_bounds);
-
+    std::vector<unsigned char>* encoded_data,
+    const gfx::Rect& snapshot_bounds,
+    SnapshotEncoding encoding = kSnapshotEncodingDefault,
+    SnapshotQuality quality = kSnapshotQualityDefault);
 
 // These functions take a snapshot of |source_rect|, specified in layer space
 // coordinates (DIP for desktop, physical pixels for Android), and scale the
@@ -54,18 +66,22 @@ SNAPSHOT_EXPORT void GrabWindowSnapshotAndScaleAsync(
     scoped_refptr<base::TaskRunner> background_task_runner,
     const GrabWindowSnapshotAsyncCallback& callback);
 
-typedef base::Callback<void(scoped_refptr<base::RefCountedBytes> png_data)>
-    GrabWindowSnapshotAsyncPNGCallback;
+typedef base::Callback<void(scoped_refptr<base::RefCountedBytes> encoded_data)>
+    GrabWindowSnapshotAsyncEncodedCallback;
 SNAPSHOT_EXPORT void GrabWindowSnapshotAsync(
     gfx::NativeWindow window,
     const gfx::Rect& source_rect,
     scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback);
+    const GrabWindowSnapshotAsyncEncodedCallback& callback,
+    SnapshotEncoding encoding = kSnapshotEncodingDefault,
+    SnapshotQuality quality = kSnapshotQualityDefault);
 SNAPSHOT_EXPORT void GrabViewSnapshotAsync(
     gfx::NativeView view,
     const gfx::Rect& source_rect,
     scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback);
+    const GrabWindowSnapshotAsyncEncodedCallback& callback,
+    SnapshotEncoding encoding = kSnapshotEncodingDefault,
+    SnapshotQuality quality = kSnapshotQualityDefault);
 
 }  // namespace ui